Electrophotographic light-sensitive printing materials

An electrophotographic light-sensitive printing material comprising a conductive base plate having formed thereon an electrophotographic light-sensitive layer containing (a) a hydrazone compound, (b) at least one compound selected from a barbituric acid derivative, a thiobarbituric acid derivative, and other charge generating materials, and (c) a resin binder,

• wherein said hydrazone compound is one member selected from the group consisting of the following general formulas (I), (II), (III), (IV), (V), and (VI):
• ##STR18## wherein X represents an oxygen atom, a sulfur atom, a selenium atom, an unsubstituted or substituted imino group, or a methylene group;
• R.sup.1 represents an alkoxy group, an aralkoxy group, or a substituted amino group shown by ##STR19## wherein R.sup.12 and R.sup.13, which may be the same or different, each represents an unsubstituted or substituted alkyl or phenyl group or R.sup.12 and R.sup.13 may represent groups which are combined with each other to form a heterocyclic ring including nitrogen atom;
• R.sup.2 and R.sup.3, which may be the same or different, each represents a hydrogen atom, a halogen atom, an alkyl group, or a lower alkoxy group;
• R.sup.4 represents a hydrogen atom, an alkyl group, an unsubstituted or substituted phenyl group;
• R.sup.5 and R.sup.6, which may be the same or different, each represents an unsubstituted or subtituted straight chain or branched alkyl group having 1 to 12 carbon atoms, an unsubstituted or substituted straight chain or branched aralkyl group having 7 to 20 carbon atoms, or a monovalent group, aryl group, formed by removing one hydrogen atom from an unsubstituted or substituted monocyclic or 2 to 4 cyclic condensed aromatic hydrocarbon, or R.sup.5 and R.sup.6 my form a carbazole ring;
• R.sup.7 represents an unsubstituted or substituted alkyl group;
• R.sup.8, R.sup.9, R.sup.10, and R.sup.11 which may be the same or different, each represents a hydrogen atom, a halogen atom, an unsubstituted or substituted alkyl group or phenyl group, an alkoxy group, an aralkoxy group, or an amino group shown by ##STR20## wherein R.sup.14 and R.sup.15 represent a hydrogen atom or the same groups as shown by R.sup.12 and R.sup.13 described above, or may combine with each other to form a condensed carbon ring or a condensed heterocyclic ring;
• A represents a monocyclic or condensed heterocyclic 5-membered ring or condensed heterocyclic 6-membered ring shown by the following structural formula:
• ##STR21## wherein Y and Z, which may be the same or different, each represents a sulfur atom, an oxygen atom, or N-R.sup.17' wherein R.sup.17' is an alkyl group having 1 to 4 carbon atoms, R.sup.16 represents a hydrogen atom, an alkyl group, an alkoxy group, an aryloxy group, an acyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, a halogen atom, a monoalkylamino group, a dialkylamino group, an amido group or a nitro group, R.sup.17 and R.sup.18, which may be the same or different, represent a hydrogen atom, an alkyl group or an alkoxy group, or may be groups which combine with each other to form a benzene ring or a naphthalene ring;
• and B represents an unsubstituted or substituted aryl group;
• and
• wherein said barbituric acid derivative or thiobarbituric acid derivative is at least one member selected from the group consisting of the following general formulas (VII) and (VIII):
• ##STR22## wherein Z represents an oxygen atom or a sulfur atom;
• R.sup.1, R.sup.2, R.sup.3, R.sup.4 and A are the same as defined above;
• and R.sup.19 and R.sup.20, which may be the same or different, each represents an alkyl group, an aralkyl group, or an unsubstituted or substituted phenyl group.